154 results about "Gyrotron" patented technology

A cylindrical waveguide with a mode converter transforms a whispering gallery mode from a gyrotron cylindrical waveguide with a helical cut launch edge to a quasi-Gaussian beam suitable for conveyance through a corrugated waveguide. This quasi-Gaussian beam is radiated away from the waveguide using a spiral cut launch edge, which is in close proximity to a first mode converting reflector. The first mode converting reflector is coupled to a second mode converting reflector which provides an output free-space HE11 mode wave suitable for direct coupling into a corrugated waveguide. The radiated beam produced at the output of the second mode converting reflector is substantially circular.

A system for beaming power to a high altitude platform is based upon a high power millimeter gyrotron source, optical transmission components, and a high-power receiving antenna (i.e., a rectenna) capable of rectifying received millimeter energy and converting such energy into useable electrical power.

An apparatus and method for molding balloon catheters is disclosed. The balloon may be molded by providing a polymeric tube within a mold having an interior cavity in the shape of the desired balloon. Microwave energy, which may be generated by a gyrotron, may then be directed toward the mold, to heat the polymeric material without heating the mold. Once heated, pressurized fluid may be injected into the tube to blow the polymeric material against the interior cavity whereupon the material can cool to form the balloon or can be further heatset by additional microwave energy and be cooled to form the balloon. In accordance with one embodiment, microwave energy can also be used without a mold to form a medical device.

A stabilized high-voltage power supply is disclosed, having a general setup similar to a pulse-step modulator. The power supply comprises a plurality of DC power modules (40) having their outputs connected in a series configuration. Each power module comprises a DC voltage source (41), a DC-DC converter (42), and an output switching circuit (43). The total output voltage of the power supply is regulated by regulating the DC link voltage at the output of each power module. This is achieved by an appropriate feedback control circuit driving the DC-DC converter of each power module. In this manlier, low output ripple and a rapid response to changes in output current can be achieved. The power supply may be used, e.g., as the cathode power supply of a gyrotron.

System for drilling boreholes into subsurface formations. A gyrotron injects millimeter-wave radiation energy into the borehole and pressurization apparatus is provided for pressurizing the borehole whereby a thermal melt front at the end of the borehole propagates into the subsurface formations. In another aspect, a system for fracturing a subsurface formation is disclosed.

Through different combinations of multiple superconducting coils, superconducting magnet forms complex electromagnetic structure. Using different modes of electrical connection forms different combinations of coils. A main coil is adopted to provide central magnetic field needed. Each compensating coil is placed at two ends outside the main coil so as to generate an even magnetic field area. Multiple compensating coils with different radii and different thickness are configured at different positions along axial direction of main coil outside the main coil in order to generate more magnetic field areas, and realize magnetic fields in different compression ratios by adjusting current of compensating coil. The main coil and compensating coils are combined through cascade parallel connections so as to form multiple current lead wires connected to external power source. The invention obtains different even magnetic field areas and magnetic fields in different compression ratio.

The invention discloses a directional coupler used for measuring microwave power of a gyrotron traveling wave tube. The directional coupler is a three-port device, which comprises a primary waveguide, a secondary waveguide which is correspondingly arranged on the side wall of the primary waveguide in a matched manner, wherein the primary waveguide is a circular waveguide comprising an input port Pin and an output port P1out; the secondary waveguide comprises a square waveguide, a transition waveguide and a rectangular waveguide which are sequentially connected, and the rectangular waveguide comprises an output port P2out; and a plurality of coupling holes, which realize power distribution between the primary waveguide and the secondary waveguide by utilizing a hole coupling method, are formed between an inner cavity of the circular waveguide and an inner cavity of the square waveguide in a penetrated manner. The directional coupler provided by the invention can realize the effect of reflecting variation situations of the microwave power of an electric vacuum amplification device in the millimeter-wave band immediately and accurately, and since the directional coupler is the three-port device, the output port P2out of the rectangular waveguide achieves the coupling from a circular waveguide TE01 Mode to a rectangular waveguide TE10 Mode.

A cathode-adjustable single anode magnetic control electron gun belongs to a single anode magnetic control electron gun that is used in conjunction with a vacuum gyrotron, and comprises an electron gun casing, a base, an electric heating wire component, a support cylinder, a regulating mechanism assembly, an electron gun cathode, a fixed annular plate, an anode and a retainer ring, wherein, the electric heating wire component comprises an electric heating wire, an electric heating wire sleeve and insulating fillers, and the electric heating wire sleeve is provided with a ring-shaped scale section, a threaded section and a guiding plane surface; the regulating mechanism assembly is arranged between the electric heating wire sleeve and the support cylinder thereof, and comprises an adjusting screw nut; in addition, the cathode-adjustable single anode magnetic control electron gun can adjust the distance between the cathode and anode according to the operating condition, the transverse to longitudinal velocity ratio of an obtained electron beam is greater than 1.0, and the longitudinal velocity spread is less than 2 percent. Therefore, the influence caused by assembly error and overheating deformation or great current and voltage variation of the electron gun can be overcome effectively, and the cathode-adjustable single anode magnetic control electron gun is characterized in that working current and voltage capable of adapting to wider range can be achieved, the discreteness of the electronic longitudinal velocity is low, the performance of the electron beam is excellent, and the power and the efficiency for later beam-wave interaction of the gyrotron can be improved and so on.

A modular solid-state MMW power source based on a topology of the lens array amplifier provides both the flexibility to scale output power and effective thermal management. The modular power source includes a single submodule that uses one or more power dividers and one or more solid-state amplification stages to divide and amplify an RF input signal into R amplified RF signals. The submodule is mounted (suitably in the X-Y plane) on the surface of a heat sink, suitably coupled to a cold backplane, to remove heat. R 1:N low loss power dividers route the amplified RF signals to R*N radiating elements. Each of the 1:N power dividers suitably reside in the X-Z plane and are stacked in the Y direction to provide a planar output of the R*N radiating elements in the Y-Z plane. Placement of the amplifier chips on the single submodule decouples the number of amplifier chips, hence output power, from the number of radiating elements. Placement of the amplifier chips away from the radiating face provides a short path with large thermal cross-section through the heat sink to the backplane to remove heat. The topology can produce high output power combined with a high antenna gain to produce large power-aperture products previously only achievable with a Gyrotron. As amplifier chips become more powerful, the topology can be adapted to use fewer chips.

A coaxial cavity gyrotron with two electron beams includes an electron gun (magnetron injection gun, “MIG,” with two beams), a coaxial beam-wave interaction cavity and an outer magnetic field tube. The coaxial beam-wave interaction cavity consists of two parts: an outer conductor and an inner conductor. The two hollow electron beams produced by the MIG are located between the outer conductor and the inner conductor. The MIG includes inner and outer anodes, with a single cathode located between the anodes. The cathode further includes two emitter rings which produce the two hollow electron beams. The entire gyrotron is immersed in the magnetic field tube such that the magnetic field profile is the same or similar to that for a coaxial gyrotron with one electron beam.

The invention discloses a dual-mode gyrotron traveling wave tube amplifier, and relates to the technology of a microwave source device. The dual-mode gyrotron traveling wave tube amplifier has two-section structure, wherein the first section is a linear amplification section which adopts loss-loading metal waveguide and works at the low step mode; and the second section is a nonlinear amplification section which adopts smooth metal waveguide works at the high step mode; the linear amplification section provides high gain for the amplifier; and the nonlinear amplification section provides high power. The nonlinear amplification section works at the high step mode, thus having higher waveguide transverse size and stability threshold current. The dual-mode gyrotron traveling wave tube amplifier solves the problems of low working current and poor stability of a single-mode amplifier, and has higher output power and more superior stability, thus being a high-power millimeter wave source with good development potential and having development prospect in the important national defense fields such as high resolution long-range radar and the like in China.

A millimeter-wave window is constructed from a high conductivity metal plate. The metallic plate is made transparent over a range of frequencies by perforating it with a periodic array of slots. In one embodiment, the millimeter-wave window is used in a gyrotron as the output window. In such a case, one suitable periodic array of slots comprises an equilateral triangular array of slots for operation at 95 GHz. By proper choice of the hole spacing and diameter, the window can be made transparent at any desired frequency. In addition to being transparent, however, the window must also be vacuum tight, as the pressure inside a gyrotron is on the order of 10-9 torr. The present invention solves this problem by covering the surface of the window with a thin layer of a suitable dielectric material, such as fused quartz.

The invention discloses a ray representation method of a gyrotron quasi-optical output system, and relates to the microwave technology. The method comprises the following steps of: a) determining an incident light angle; b) selecting the curved surface shape of two mirror reflectors; c) orderly placing the first mirror reflector and the second mirror reflector on an output light path of a gyrotron radiator; d) converting the propagation characteristics of a millimeter wave beam on the first mirror reflector and the second mirror reflector into a light propagation process of a light ray on the first mirror reflector and the second mirror reflector; e) charting the reflected propagation path of the light ray in a first mirror reflector and second mirror reflector conversion system; f) according to the propagation path chart formed in the step e), guiding design and rectification of the curved surface of the reflector of a quasi-optical mode converter, and finishing. The representation method provided by the invention is accurate, simple, practical and low in cost.

The invention discloses an inclined multi-path synthetic gyrotron traveling wave tube TE02 mode input coupler, and belongs to the technical field of microwave and millimeter wave devices. The input coupler comprises a power distribution part, an inclined multi-path synthesis part and a cut-off circular waveguide. According to the invention, a high-purity TE02 mode is coupled in a main circular waveguide by adopting an inclined multi-path synthesis structure, and by changing the number and position distribution of the branches of rectangular waveguides on the side wall of the main circular waveguide and the included angle between the branches of the rectangular waveguide on the side wall and the circular waveguide, the field distribution of the main competitive modes (TE01 and TE41) of a TE02 mode in the main circular waveguide is destroyed to improve impedance matching, so that the beneficial effects of effectively suppressing a parasitic mode, reducing a reflection coefficient, improving conversion efficiency and increasing bandwidth are achieved.

The invention provides a waveguide mode exciting device which comprises a first mode conversion assembly and a second mode conversion assembly. The first mode conversion assembly is used for converting the mode of millimeter waves from a TE 10 fundamental mode to a circular waveguide TE61 mode, and the second mode conversion assembly is used for being communicated with the first mode conversion assembly and converting the mode of the millimeter waves from the circular waveguide TE61 mode to the circular waveguide TE62 mode. According to the waveguide mode exciting device, by means of a mode conversion chain of converting the rectangular waveguide TE10 mode into the circular waveguide TE62 mode, the high-purity target mode output is obtained, a parasitic mode is effectively restrained, and the obtained high-purity target mode can be used for cold measuring of a gyrotron interaction circuit and a standard light mode converter system.

The invention discloses a quasi-optical mode conversion device and a quasi-optical mode conversion method of a terahertz multimode frequency adjustable gyrotron. The high order electromagnetic beams with different modes and different frequency are effectively radiated by using a waveguide radiator, and the device works at multiple waveguide modes and each mode has high tunable bandwidth; a quasi-ellipse shape reflector performs angular focusing on high order electromagnetic beams; a bifocal parabolic reflector performs axis focusing on the electromagnetic beams to form multi-mode frequency tunable Gaussian beams, after the directions of the beams are adjusted via a plane reflector, the beams are output via an output window positioned at the waist of the Gaussian beams. According to the device and the method provided by the invention, the problem that the quasi-optical mode conversion device of the terahertz multimode frequency adjustable gyrotron cannot synchronously work under the multiple broadband modes is solved, the device and the method are applicable to the terahertz multimode frequency adjustable gyrotron, and the efficient quasi-optical mode conversion can be achieved on the broadband range of the multiple modes in the gyrotron.

The invention relates to the technical field of microwave electronic devices, in particular to a coupling output segment of a gyrotron traveling wave tube amplifier. The coupling output segment is connected with a high-frequency interaction segment and comprises a first output segment body and a second output segment body, wherein the first output segment body and the second output segment body both satisfy the requirements of a Chebyshev tapered waveguide structure, the first output segment is connected with the second output segment, and the radius of the tail end of the first output segment is equal to the initial radius of the second output segment. According to the coupling output segment of the gyrotron traveling wave tube amplifier, the reflection of a working mode TE01 and mode coupling from the working mode TE01 to a higher-order mode TE02 can be effectively suppressed, and the transmission performance of the gyrotron traveling wave tube amplifier is improved.

The invention discloses a terahertz gyrotron gallery mold backward wave interaction circuit and a control method thereof. According to the circuit and the control method, two gradation structures areled into a main cavity body, so that the nonuniformity of the circuit is improved; the cut-off frequency of a main high angular index competition mode is higher than that of an operating mode, so thata start oscillation characteristic of the circuit is that the circuit is particularly sensitive to a nonuniform circuit in a single-cavity oscillation state; a start oscillation current curve is greatly improved and effectively inhibited; and single-mode stable high-efficiency output of a high-order gallery operating mode is achieved. The circuit can specifically inhibit mode competition nearby the high-order gallery mode in a terahertz gyrotron backward wave oscillator; the operating stability and the operating efficiency of the gyrotron backward wave oscillator can be improved; and the significance from microwave and millimeter wave bands to a terahertz wave band is important for the gyrotron backward wave oscillator.

The present invention discloses a Gaussian beam mode filter with a diagonal horn structure and an implementation method thereof. The Gaussian beam mode filter with the diagonal horn structure is designed on the basis of a characteristic that a corrugated horn can generate high-purity hybrid HE11 modes and the principle of antenna reciprocity; when undesired Gaussian beams radiated from an gyrotron output window pass through a first corrugated horn, only a single TE11 mode passes the first corrugated horn; the TE11 mode is subjected to mode conversion of a second corrugated horn, so that highly-pure mixed HE11 modes are generated; and the highly-pure mixed HE11 modes are finally fed into an overmoded waveguide transmission line. With the Gaussian beam mode filter with the diagonal horn structure and the implementation method thereof of the invention adopted, the problem of undesired Gaussian modes of quasi-optical transmission can be solved, the purity of Gaussian modes fed into the transmission line can be effectively improved, and therefore, the high-efficiency transmission of terahertz waves can be realized.

The present invention discloses a heater structure of magnetron injection gun, which relates to microwave technology. The heater is formed by the circular ring circled by spiral cylindrical tungsten filaments or rhenium tungsten filaments. First structure of the heater is that two semicircles are formed by spiral cylindrical tungsten filaments or rhenium tungsten filaments; the two ends of each semicircle are provided with a bar-shaped lead; and a circular ring is then formed by fixedly connecting the four bar-shaped leads in pairs. The second structure is that the spiral cylindrical tungsten filaments or rhenium tungsten filaments are shaped into a circular ring, of which the two ends are provided with straight-bar-shaped leads having a clearance arranged therebetween. The heater structure of the present invention is applicable to various magnetron injection guns of gyrotron, and the processing technology is easy and convenient. Moreover, the heater is high in heating efficiency and is unlikely to bring about short-circuit failure.